Also works without power supply

Got the new adapter today and equal to a Sony Bravia TV (older model) a couple of videos played from my Nexus 7 (2013). Everything went wonderfully, except for the sound. The has some videos (with some bass) boomed. This was certainly not the videos, with others it has worked well. After the video format I have not looked, but that should actually have no effect, since only the screen / sound is mirrored ... for presentations, I think this is no problem, if the sound is important but you should investigate the previously accurate.

What I liked is that the adapter works without additional power source. Simply with Nexus and HDMI cable connected to the TV and the picture could be seen (and heard the sound).

Since I have tried the adapter just as short, I can not make any information regarding shelf life, it affects processed at first impression sound when it goes contrary to expectations in the next few weeks break there is a devaluation)